package com.soft.zzti.controller.exception;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

public class CustomExceptionResolver implements HandlerExceptionResolver{

	public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object obj,
			Exception exception) {
		//handler就是处理器适配器要执行Handler对象，只有method
		/*
		 * 思路：
		 * 解析出异常类型，如果该 异常类型是系统 自定义的异常，直接取出异常信息，在错误页面展示
		 * 如果该 异常类型不是系统 自定义的异常，构造一个自定义的异常类型（信息为“未知错误”）
		 * message="未知错误";
		 */
		CustomException customException = null;
		if(exception instanceof CustomException) {
			customException = (CustomException) exception;
		}else {
			customException = new CustomException("未知错误");
		}
		//错误信息
		String message = customException.getMessage();
		
		ModelAndView modelAndView = new ModelAndView();
		
		//将错误信息传到页面
		modelAndView.addObject("message", message);
		
		//指向错误页面
		modelAndView.setViewName("error");
		return modelAndView;
	}

}
